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In this paper, TDOA (time difference of arrival) measurements from pilot signals of a wireless communication network is proposed to solve the navigation problem in the case that under the environments that each BS(base station) have NLOS(non-line-of-sight) error. TDOA measurements are known to have poor accuracy due to technical limitations of a(More)
Based on a sequence of successive-time double-differences of pseudorange and carrier phase measurements provided by the Global Positioning System (GPS), a channelwise test statistic is proposed. The proposed test statistic is particularly efficient in multipath detection and operationally advantageous: it requires only basic observables, it requires no(More)
The well-known conventional Kalman filter gives the optimal solution but requires an accurate system model and exact stochastic information. Thus, the Kalman filter with incomplete information may be degraded or even diverged. In a number of practical situations, the system model and the stochastic information are incomplete. To solve this problem, a new(More)
In this paper, we analyze the ranging performance of chirp spread spectrum (CSS) in two-ray multipath indoor environment. Reflected multipath signals will affect the received signal in the receiver deforming the correlation shape and thus will alter the real value of ranging. In indoor environment, conventional methods for tracking positions are(More)
In this study, we analyzed the effect of a constant transmission delay that occurs in delivering measurements from a global positioning system receiver to a Kalman filter for an aided strapdown inertial navigation system and propose an efficient delay calibration algorithm. A new error model for the circular trajectories is derived to show that all the(More)